Earthquake

Earthquake deals X damage to each creature without flying and each player.

Birds of Paradise

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Target player untaps all basic lands they control.

Whenever a Forest is tapped for mana, its controller adds an additional {G}.

Search your library for a basic land card, put that card onto the battlefield, then shuffle.

When Wood Elves enters the battlefield, search your library for a Forest card, put that card onto the battlefield, then shuffle.

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional {G}.

You may have Thorn Elemental assign its combat damage as though it weren't blocked.